Transition State in a Noisy Environment

Transition state in a noisy environment.

Transition state theory overestimates reaction rates in solution because conventional dividing surfaces between reagents and products are crossed many times by the same reactive trajectory. We describe a recipe for constructing a time-dependent dividing surface free of such recrossings in the presence of noise. The no-recrossing limit of transition state theory thus becomes generally available ...

Speech Enhancement in a Noisy Car Environment

We present a new speech enhancement method for robust speech recognition in a noisy car environment. The method is based on the combination of two important building blocks, namely blind source separation given two microphone signals and speech denoising using a hybrid Wavelet Independent Component Analysis (ICA) filterbank. The first block separates point sources such as the passenger’s voice ...

LTD Facilitates Learning in a Noisy Environment

Gerardina Hernandez Intelligent Systems Program University of Pittsburgh Pittsburgh PA 15260 [email protected] Long-term potentiation (LTP) has long been held as a biological substrate for associative learning. Recently, evidence has emerged that long-term depression (LTD) results when the presynaptic cell fires after the postsynaptic cell. The computational utility of LTD is explored here. Syna...

Automatic speech recognition in a noisy environment

Hunting French Ducks in a Noisy Environment

We consider the effect of Gaussian white noise on fast–slow dynamical systems with one fast and two slow variables, containing a folded-node singularity. In the absence of noise, these systems are known to display mixed-mode oscillations, consisting of alternating largeand small-amplitude oscillations. We quantify the effect of noise and obtain critical noise intensities above which the small-a...